Here, I use the bed they are in as an 'on the fly' compost pile. Things break down rapidly here and so I throw all the cuttings and the pond debris and even spent flowers I've had in the house in underneath them. Once a year I add peat and some time release fertilizer but mostly it is compost. I have a type that is broad leafed and not as tall as most, mainly I want them for screening and the look of the leaves however I get a lot of bananas from them. Too many actually, I have two stalks growing now and just got rid of another one a month ago. The fruit is smaller than the US supermarket type and sweeter but not one of the specialty flavors. There is only so much banana bread, banana cake, banana ice cream, and bags of frozen bananas that one family can use. They are hard to give away because everyone has the same problem.
The last bloom starting out.
Dividing up the fruit.
This is my banana bed, I'd just cut off the trunk of the previous bloom's plant it is leaning against the bed near the pool scoop. You can see I throw all the banana leaves in there as well. The 2 large trunks are the ones that are now fruiting and those small pups are as large as the big ones now.
